diff --git a/crypto/s390x_arch.h b/crypto/s390x_arch.h
index fa920d1..3b489b9 100644
--- a/crypto/s390x_arch.h
+++ b/crypto/s390x_arch.h
@@ -72,6 +72,9 @@
     unsigned long long kdsa[2];
 };
 
+#if defined(__GNUC__) && defined(__linux)
+__attribute__ ((visibility("hidden")))
+#endif
 extern struct OPENSSL_s390xcap_st OPENSSL_s390xcap_P;
 
 /* Max number of 64-bit words currently returned by STFLE */
diff --git a/crypto/s390xcap.c b/crypto/s390xcap.c
index f8e0234..d433df9 100644
--- a/crypto/s390xcap.c
+++ b/crypto/s390xcap.c
@@ -74,6 +74,9 @@
 
 struct OPENSSL_s390xcap_st OPENSSL_s390xcap_P;
 
+#if defined(__GNUC__) && defined(__linux)
+__attribute__ ((visibility("hidden")))
+#endif
 void OPENSSL_cpuid_setup(void)
 {
     struct OPENSSL_s390xcap_st cap;